Crowdfunding platforms such as GoFundMe and YouCaring have turned sympathy for Americans drowning in medical expenses into a cottage industry. Now Republican efforts in Congress to repeal and replace Obamacare could swell the ranks of the uninsured and spur the business of helping people raise donations online to pay for health care.

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With enough volume, the business of helping people raise money for medical care has a lot of profit potential. GoFundMe takes 5 percent of each donation, 2.9 percent goes to payment processing, and there’s a 30¢ transaction fee. Smaller sites, such as Fundly and FundRazr, charge much the same. YouCaring donors pay just a 2.9 percent processing fee plus the 30¢.

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For more and more Americans, vying in a popularity contest for a limited supply of funds and sympathy may be the only way to pay the doctors and stay afloat. House Republicans passed a bill last month to replace the Affordable Care Act, or Obamacare. As is, the Congressional Budget Office estimates, it would leave 23 million more Americans uninsured in 2026 than under the ACA. Even a law just resembling the bill is likely to raise the cost of health care for older and sicker Americans and for those with preexisting conditions, bolstering the medical crowdfunding business.